Emiliano Zapata was a Mexican revolutionary leader who fought for the rights of peasants and indigenous people during the Mexican Revolution. He is remembered for his famous rallying cry, 'Viva la Revolución!' which translates to 'Long live the revolution!' The term 'Zapata!' is often used to express solidarity with his cause and to honor his memory. The four-letter crossword solution 'VIVA' is an abbreviation of this phrase, and serves as a reminder of Zapata's legacy.